Improvement in millers  proof-staffs and red-staffs



T. M. LOGAN. Millers Proof Staff and Red Staff.

No.213,339. Patented Mar. 18,1879.

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. a 2M, z/A MM/ g UNITED'STATES PATENT OFFICE.

THOMAS M. LOGAN, OF MAPLETON DEPOT, PENNSYLVANIA.

IMPROVEMENT IN MILLERS PROOF-STAFFS AND RED-STAFFS.

Specification forming part of Letters Patent No. 213,339, dated March18, 1879; application filed May 8, 1878.

To all whom it may concern:

Be it known that I, THOMAS M. LOGAN, of Mapleton Depot, in the county ofHuntingdon and State of Pennsylvania, have invented certain new anduseful Improvements in Millers Proof-Staffs and Red-Staffs; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as Wlll enable others skilled in the art to whichit pertains to make and-use it, reference being hadto the accompanyingdrawings, which form part of this specification.

My invention relates to an improvement in millers proof-staff andred-staff dressers; and it consists, first, in the combination of aproof and red staff dresser with a cutting-plane in proof -st-aff;second, in the arrangement and combination of parts, that will be morefully described hereinafter.

The accompanying drawings illustrate my invention, and of these Figure 1is a side elevation with the lid and side door open. Fig. 2 is aVertical longitudinal section of the whole device.

a represents a box, with a side door, a, secured by a button, andthrough which the parts may be adjusted, and a lid, a, fastening with acatch, and attached to the box by means of hinges, or by hooks and eyes,so that it may be taken off at pleasure.

Within and at either end of the box are fastened two wooden blocks, withtheir two approximating ends cut away in the shape of a V, so as to formthe throat of a plane, as shown at b. Upon these blocks is set themarble or stone slab c, which forms, so arranged, the proof-staff andplane-sole of the combined tool. Upon the face of slab c is cut therecess 0, with rabbeted edges. Into this recess opens a slot, 1, throughwhich passes the plane-iron d, which works back and forth between thetwo projecting guides or flanges of a steel shoe,

d, which forms the facing of the plane-bed.

The plane-iron is operated through side door, a, by means of twoclamping-bolts turned by a wrench. The clamping-bolts work in a slot, sothat the plane-iron can be moved up or down over the steel shoe atpleasure.

In the recessc' fits, by means of its rabbeted edges, the steel slide 0,and when this is inserted the bolts holding the plane-iron in positionare loosened, and the cutting-edge is allowed to fall down in the slot.

It will thus be seen that slab 0 presents, at will, either a smoothunbroken surface or the sole of a plane-stock with its plane-iron.

The tool is designed to be used as follows: Dropping the plane-irondown, slide 0 is inserted, and the tool becomes a proof-staff. If it isdesigned to mark the irregularities on the red-stafi, the surface ofslab c-slide 0" being in situis smeared with oil. The redstaff to beproved is applied to the surface of the proof-staif, and the oil uponthe latter marks the prominences. If it is designed to remove theseprominences, slide a is taken out, the plane-iron is set, and thered-staff is operated upon the surface of the proof-stafi as an ordinaryjack-plane or dressing-plane.

I find that there are very great advantages in the use of marble orstone for the improved proof-staff, as well as for the plane-sole,because it does not expand or contract through changes of temperature,and always remains true. It is, moreover, very much cheaper than if ironor steel were used.

I do not, however, limit myself to the specific use of marble or stone,as porcelain, glass, or any other suitable non-expanding material may beused.

I am aware that an iron frame in which the proof-staff (made of wood)has been secured, and then a plane used to dress the rod, is old; andthis I disclaim.

Having thus described my invention, I claim- 1. A millers proof-staffand red-staff dresser combined with a cutting or dressing plane in asingle tool, and with a suitable box, in which it operates,substantially as shown.

2. The proof-staff and red-staff dresser con sisting of slab c, withslide 0, in combination with the jack-plane or dressing-plane composedof plane-stock a, recess 0, slot (1, plane iron d, and steel shoe d,with its flanges or guides, and all working and operating within box a,with side door, a, and lid a, substantially as set forth.

3. In a millers proof and red stafl', the man In testimony that I claimthe foregoing I ble slab or block 0, the said slab forming both havehereunto set my hand this 3d day of the plaine-s01e and proof-stafl',substantially as April, 1878.

shown and described. THOMAS MILES LOGAN.

4. A millers pr00f-staif having its proving- 'itnesses:

surface made of marble or stone, substantially JAMES MAGUIRE,

as shown and described. MARSHALL YOGUM.

